I think your lower leave thing is a slight nute deficient thing. I was getting that before I started to ramp up the bloom nutes in week 3. Before that. I was giving veg nuts all the way up to point of sexing them. Then would rez change to bloom nutes. Now I try to feed a bit of the bloom nute in 3 days before that rez change. Just a small bit to give them a taste. I'm not exactly sure what it is(I think it might be a nitrogen thing), and I'm real sure there are a lot of people that know a lot more about nutes than me. I'm still learnin nutes lol. Now I just lose the lower leaves when the light cant get to them any more.